diff --git a/AccordionBus/AccordionBus/AbstractMap.cs b/AccordionBus/AccordionBus/AbstractMap.cs
index 06068a2..494b6cd 100644
--- a/AccordionBus/AccordionBus/AbstractMap.cs
+++ b/AccordionBus/AccordionBus/AbstractMap.cs
@@ -165,24 +165,23 @@ namespace AccordionBus
             {
                 return false;
             }
-            var otherMap = other as AbstractMap;
-            if (otherMap == null)
+            if (other == null)
             {
                 return false;
             }
-            if (_width != otherMap._width)
+            if (_width != other._width)
             {
                 return false;
             }
-            if (_height != otherMap._height)
+            if (_height != other._height)
             {
                 return false;
             }
-            if (_size_x != otherMap._size_x)
+            if (_size_x != other._size_x)
             {
                 return false;
             }
-            if (_size_y != otherMap._size_y)
+            if (_size_y != other._size_y)
             {
                 return false;
             }
@@ -190,7 +189,7 @@ namespace AccordionBus
             {
                 for (int j = 0; j < _map.GetLength(1); j++)
                 {
-                    if (_map[i, j] != otherMap._map[i, j])
+                    if (_map[i, j] != other._map[i, j])
                     {
                         return false;
                     }
diff --git a/AccordionBus/AccordionBus/FormMapWithSetBuses.cs b/AccordionBus/AccordionBus/FormMapWithSetBuses.cs
index 4025ef7..e83a7dc 100644
--- a/AccordionBus/AccordionBus/FormMapWithSetBuses.cs
+++ b/AccordionBus/AccordionBus/FormMapWithSetBuses.cs
@@ -157,6 +157,11 @@ namespace AccordionBus
                 _logger.LogWarning($"Ошибка переполнения хранилища: {ex.Message}");
                 MessageBox.Show($"Ошибка переполнения хранилища: {ex.Message}", "Результат", MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
+            catch (ArgumentException ex)
+            {
+                _logger.LogWarning($"Ошибка добавления: {ex.Message}");
+                MessageBox.Show($"Ошибка добавления: {ex.Message}");
+            }
             catch (Exception ex)
             {
                 _logger.LogWarning($"Неизвестная ошибка: {ex.Message}");
diff --git a/AccordionBus/AccordionBus/SetBusesGeneric.cs b/AccordionBus/AccordionBus/SetBusesGeneric.cs
index 5de6f7f..4e9cc11 100644
--- a/AccordionBus/AccordionBus/SetBusesGeneric.cs
+++ b/AccordionBus/AccordionBus/SetBusesGeneric.cs
@@ -52,7 +52,7 @@ namespace AccordionBus
             // Проверка на уникальность
             if (_places.Contains(bus))
             {
-                return -1;
+                throw new ArgumentException("Объект с такими характеристиками уже существует в наборе.");
             }
             //проверка позиции
             if (Count == _maxCount)